Blackboard-eraser



No. 618,759. Patented J in. 3|, I899. c..|.. YEO.

BLACKBUARD ERASER.

(Application filed Apr. 2, v1898.)

(No Mddel.)

Witnesses.

' UNITED STATES ATENT Fries.

CHARLES LEROY YEO, OF BATTLE CREEK, MICHIGAN.

BLACKBOARD-ERASER.

SPECIFICATION forming part of Letters Patent No. 618,759, dated January31, 1899.

Application filed April 2, 1898. derial No. 676,243. (No model.)

To all whom it may concern:

Be it known that LOHARLEs LEROY YEo, a citizen of the United States,residing at Battle Creek, in the county of Calhoun and State ofMichigan, have invented certain new and useful Improvements inBlackboard-Erasers; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to letters ofreference marked thereon, which form a part of this specification.

Figure 1 of the drawings is a perspective view of an eraser embodying myinvention. Fig. 2 is a transverse vertical section of the same. Fig. 3is a longitudinal vertical section, and Fig. 4 is a detail perspectiveview of one of the bridge-pieces.

This invention is designed to provide a blackboard-eraser which isconstructed in such a manner as to absorb and collect the chalk-dustinstead of throwing it off into the air, which is self-cleaning andcannot be overcharged with dust, and which is constructed in such amanner that the rubbers can be readily removed and replaced, if desired.

With these objects in view the invention consists in the novelconstruction and combination of parts, all as hereinafter described, andpointed out in the appended claims.

Referring to the accompanying drawings, the letter A designates theframe or body of the eraser, which is in the form of a hollow box closedat the bottom by a removable slide A and open at the top, except for therubbers B. The rubbers consist each of edgewise-disposed strips of feltsecured in metal holders 0 and placed side by side in parallel positionsin the upper portion of the box. The holders 0 consist each of a pieceof sheet metal bent longitudinally upon itself to forma U -shaped clasp,in which the inner edge portion of the felt is placed and secured bypunching orindenting the metal, as shown at c. The holders are eachperforated near each end and are slipped upon transverse rods or wiresD, supported in the lateral portions of the box. The holders are alsopreferably supported by transverse notched bridge-pieces E, upon whichthey rest. A transverse edgewise-disposed piece of felt F is usuallyplaced at each end of the series of rubbers, as shown. The rubbers arealso preferably arranged so as to form a slightly-convexrubbing-surface.

Placed in the box underneath the rubbers are two longitudinal inclinedplates G, which form a trough open at the center.

The operation of the eraser is as follows: When the eraser is moved inone direction over the board, the strips or sections are all pressed orlean in one direction. This gives the face of the eraser a corrugatedform and allows the chalk-dust to catch and settle in the spaces ordepressions thereof. When the motion is reversed and the eraser isshoved in the opposite direction, the strips or sections are pressed orlean in the opposite direction and the dust works through between themand falls into the trough. The natural handling and turning of theeraser and the jar cause the dust to fall through the slit in the bottomof the trough into the dust-receptacle, from whence it cannot get backinto the trough.

The accumulated dust may be removed from the receptacle at any time byremoving the slide A. It will be seen, therefore, that the eraserisperfectly self-cleaning in its ac.- tion and that the rubbers cannotbecome overcharged with dust and throw it'oif into the air.

The slightly rounded or convex face of the eraser serves to keep thedust nearer the center and in better position to be absorbed. Aperfectly flat-faced eraser has somewhat of a tendency to shove thechalk-dust ahead of it and drop it.

When the felt sections or strips become worn out, they may be readilyremoved from the box by removing the rods or wires D, and new sectionsor strips may be supplied.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The herein-described blackboard-eraser, consisting of the box-likebody, one side of which is a removable slide, a rubber composed of anumber of independent strips of felt or other suitable material,removably secured in the opposite side of said body, and arranged topermit chalk-dust to pass between them into said body, and alongitudinally-arranged trough within said body with its open sidefacing the rubber and having a slot at its bottom, substantially asspecified.

2. The herein-described eraser, consisting of a box-like body having aslide at one side, the rubber composed of a number of perforatedmetal-bound rubbing-strips arranged side by side to permit chalk-dust topass between them into said body, theremovable wires or rods whichengage the perforations of said strips and secure them in said body, thetransverse notched bridge-pieces which support the said stripsintermediately of the transverse wires or rods, and the trough arrangedin the said body with its open side facing the said strips and having aslot in its bottom, substantially as specified.

3. In a blackboard-eraser,the box-like body, the trough therein having aslot at its bottom, the independent metal-bound rubbingstrips, thetransverse rods or wires which se- CHARLES LEROY YEO.

Witnesses: 1

GEO. F. NEALE, HERBERT 0. I-IERRIcK.

